My car runs ok for a mile and then starts to hesitate and almost stall then shoots forward and almost stalls and shoots forward etc. I have replaced the mass air flow sensor and spark plugs and fuel filter and used injector cleaner. Each fix helps for a couple of days and then the hesitation comes back.The problem is somewhat intermitant.
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Could be several things; MAF ( Mass air Flow) sensor, (Yes you should have one), could be fuel pump on the rail or the filter next to it, could be electronic idle controler, clogged injectors, ect ect, a Volvo dealer can do some simple checks of the actual components and tell you, but have someone else fix it!